API 682 PLAN 72

API 682 Plan 72 Panel is used as a buffer gas regulating and monitoring system for a dual unpressurized mechanical seal with a dry running outboard containment seal. The system can be used alone or in conjunction with a Plan 75 and/or Plan 76 system. The sealed fluid can be a mixture of either a condensing or flashing fluid.

Inert buffer gas, typically Nitrogen, is regulated by the Plan 72 Panel. This buffer gas is supplied at low pressure to the outboard containment seal which acts as a vehicle to sweep emissions to a vapour recovery unit or flare. This system will also provide a blanket to the primary inboard seal, thus reducing reactivity risks of leakage to the atmosphere. Upset conditions actuate switches or transmitters in the system alarming high / low flow or pressure situations which acts as an indicator of seal performance.